Air-pump.



G. PAGEL.

AIR PUMP.

A PPLicATloN mm APR. 3. i915.

il @@WF Patented May 28, Mw

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254 @UstV/PQSEQL, b1@ f 5MM? 977W "J www@ G. MGEL.

AIR PUMP.

APPLICATION FILED APR. 3, 1915.

Iatented May 28, MIIB.

2 SHEETS-SHEET I.

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GUSTRV lEGRL, 0F BERLIN, GERlllllAlW, ASSIGNOR T0 GENERAL ELECTRIC CIllFPt.

CURJPORATION F NRW YORK.

MRI-PUMP.

Specication of Letters Patent.

Patented lttlay 2d, 191th..

application and april a, 1era. smal no. 19,0413.'

To all whom t may concern;

Be it known that l, GUs'rAv lPAenL, a subject of the King of lPrussia, residing at Berlin, Germany, have invented certain new and useful Improvements in Air-Pumps, of which the following is a specification. y

'lhe present invention relates to air pumps for drawing od' air or air and vapors from condensers or similar devices, and has for its object to provide an improved apparatus for this purpose.

vlln carrying out my invention, ll employ a suitable pump, as a centrifugal air pump of the water throwing type, or a helical pump, and arrange on the suction side thereof a iluid ejector, lpreferably a steam ejector, or a water ejector, or a combination of the two, in such a manner that the diverging portion of the 'discharge nozzle which forms the vcompression chamber is directly in front of and extends up to the inlet of the pump. lln my preferred structure l use a water throwing pump in combination with a steam ejector and so arrange them that the water for the pump acts as a cooling medium for condensing the steam used in the ejector. This gives a particularly economical and efficient arrangement and one capable of maintaining a high vacuum.

For a consideration of what ll believe to be novel and my invention, attention is directed to the accompanying description and claims appended thereto.

ln the accompanying drawings, Figure 1 is a sectional view through one form of apparatus embodying my invention; Fig. 2 is a section taken on line 2-2, Fig. 1; and lFig. 3 is a view, partly in section, of a second form or embodiment of my invention.

Referring rst to lFigs. 1 and 2, t indicates a water throwing air pump of suitable conv struction-I and comprising the usual casing 5 dit the diverging portion 13a of which the ve` locity of the steam and air or air and vapors 1s converted more or less into pressure. rll`he divergmg portlon 13a constitutes 1n substance a compression chamber. llt is formed at its outer end with tl-shaped indentations or passages 14 and surrounding it is a wall 15 formin a chamber 16 into which conduit 8 lea s, and from which water is fed to the impeller 7 through the indentations.

Steam is supplied to the ejector through pipe 17 andA the suction chamber 12- is connected to the condenser or other .apparatus from which the air or -vapors is to be drawn by pi e 18.

n operation, steam is admitted through pipe 17 and is discharged from the nozzle 11 at a high velocity into the discharge nozzle 13 drawing with it air and vapors from the chamber 12. lln the diverging portion 13a of the discharge nozzle the velocity of the mixture of steam, air and vapors is to a greater or less extent converted into pressure. At the same time water for the throwing pump is being supplied through conduit 8 to the chamber 16 and then by way of the indentations or passages 141 to the impeller. rllhis water in Howing around the nozzle 13 condenses all or the greater portion of the steam therein and thus materially decreases the volume of material to be handled by the water throwing pump. The operation of this type of pump is well understood. 'llhe vanes of the impeller as they pass by the ends of the indentations 14: in the nozzle 1? cut od successive slugs of water between which the air and vapors from the ejector are entrappcd and compressed, and the whole is discharged through conduit 9. rllhis conduit will preferably be connected with a suitable separator for separating the air from the water. The water may then be used again in the pump or it may be used vfor feed water.

Referring now to the modication shown in ltig. 3, 20 indicates a centrifugal pump having the casing 21, impeller 22 and discharge conduit 23. lln this instance ll have shown the pump in connection with both a steam and a water ejector, the steam ejector being in advance of the water ejector, as regards the direction of How, and discharging into the diverging portion of discharge nozzle of the water ejector. rllhe discharge nozzle of the water ejector extends up to the inlet of the pump and -is connected directly thereto. 2a indicates the steam ejector having the steam nozzle 25 which receives steam through pipe 26. 27 is the suction chamber tti coA

titi

lill@ handle.

connected by conduit 28 to a condenser o1'. other apparatus from which the air or air and vapor are to be drawn, and 29 is the discharge nozzle. The water ejector comprises a casing 30 which receives water by way of conduit 31 and from which the water is discharged through the diverging portion of the discharge nozzle or compression cham@ ber 32 directly to the pump casing. The discharge nozzle 29 of the steam ejector projects through the casing 30 of the water ejector and terminatesat substantially the narrowest point, z'. e. the throat, of the vdischarge nozzle 32. Between the end of nozzle 29 and the throat of nozzle 32 is an annular space 33 through which the water from chamber 30 is forced in passing through nozzle 32 to the pump. In other words, the noz z le 29 forms the suction pipe` of the water. ejector. In operation the steam jet discharged from steam nozzle 25 sucks up the air and vapors through conduit 28 and discharges them into the nozzle 29 from which they are drawn by the action of the water ejector, the flow of the water from chamber 30 through space 33 around the end of nozzle 29 creatin a suction therein as is well understood. n other words, the steam ejector and the water ejector work in series.v The water of the water ejector acts to condense the` steam from the steam ejector so that the pump 2O has a much less volume to In this arrangement the discharge conduit 23 of the pump is shown as connected to an air separator'and cooling device. It comprises a casing 35 having a horizontal partition 36 at its lower end forming a chamber 37 and a horizontal partition 38 and a vertical partition 39 at its upper end forming two chambers 40 and 41. The chambers 40 and 41 and chamber 37 are connected by a plurality of pipes 42. 43 and 44 are admission and discharge conduits connected to chambers 40 and 41 respectively and through which cooling water is admitted. This water enters chamber 40, flows down through the left-hand group of tubes 42 to chamber 37 thence up through the right-hand group of tubes 42 to chamber 41 and out through conduit 44. 45 is a baiiie plate for directing the water and air and vapors discharged from conduit 23 in a tortuous path over the cooling tubes 42. It also acts to abruptly break the direction of flow of the water and this assists in the separation of the air and vapors therefrom. The air and vapors separate from the water in chamber 35, and rising to the upper portion thereof escape through the relief valve 46. 47 is an opening through the upper portion of baie plate 45 to permit of the passage of air to the relief valve. The water in passing over the tubes 42 is cooled yand flows to the conduit 31 and is again used in the water ejector.v

Its passage through conduit 31 may be controlled by a valve 48. The cooling water used in the cooler and air separator may be the feed water for a boiler, thus effecting an economy in heat.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States, is,-

1. In an apparatus of the character described the combination of a pump and a Huid ejector arranged on the suction side thereof with the diverging portion of its discharge nozzle extending up to and connected directly with the inlet of the pump.

2. The combination with a centrifugal pump, of an ejector apparatus arranged on the suction side thereof, said ejector apparatus having a diverging discharge nozzle which extends up to and discharges directly into the inlet of the pum 3. In an apparatus o the character described, the combination of a centrifugal water throwing pump, a steam ejector arranged on the suction side thereof with its discharge nozzle extendingup to and discharging directly into the inlet of the pump, said nozzle being formed with indentations, and means for ceding throwing water through said indentations to the pump.

4. In an apparatus of the character described, the combination of a centrifugal pump, a discharge nozzle extending up to and connected directly to the inlet of the pump, a steam nozzle discharging i'nto said rst named nozzle, and means for supplying water around the discharge nozzle to said pump.

5. In an apparatus of the character described, the combination of a centrifugal water throwing pump, a steam ejector are ranged on the suction side thereof with its discharge nozzle extending up to and discharging directly into the inlet of the pump, said nozzle having V-shaped indentations therein which extend down to the pump inlet, a casing surrounding said nozzle, and means for supplying throwing water to said casing from which it iows through said indentations to the impeller of the pump.

6. In a water throwing pump, the combination of a casing having an inlet, an impeller located in the casing, an elastic Huid ejector having a diverging discharge nozzle, said nozzle extending up to and discharging directly into the inlet of the pump, and means for supplying water to the pump.

7. In an apparatus of the character dcscribed, the combination of a centrifugal recaen? pump having an inlet and an outlet, a steam ejector arranged on the suction side thereof with its discharge nozzle adjacent to and discharging directly into the -inlet of the pump, and means independent of the ejector and connected directlywith the inletoitI the pump for supplying Water thereto.

8. In an apparatus of the character described, the combination of a centrifugal pump having an inlet and an outlet, a conduit connected to the inlet of the pump for supplying water thereto, and an ejector comprising a nozzle throughl which-pumping Huid is admitted anda discharge-nozzle, arl ranged on the suction side offfthe'puinp, said 15 discharge nozzle heing separate from said.' conduit andl extending up to and discharging directly into the inlet of the pump.

PAUL Ho, Amman Panier. 

